Solving algebraic equations with negative exponents

solve for x: x^-2 = 1/9

solve for x: x^-2 - 13x^-1 +36 = 0

I don't understand how to solve either equations.

The Attempt at a Solution

Remember that $$x^{-a}=\frac{1}{x^a}$$ so try multiplying through by x2 in both.